Pump plunger



y 6 v. SANTARELLI 3,044,411

PUMP PLUNGER Filed June 20. 1958 INVENTOR.

VINCENT SANTARELL! ATTORNEY S United rates Patenr @f 3,044,411 PUMP PLUNGER Vincent Santarelii, 6509 Heintz Ave, Detroit, Mich. Filed June 20, 1958, Ser. No. 743,288 2 Claims. ((11. 103-453) My invention relates to a new and useful improvement in a pump plunger adapted for use on pumps for pumping liquid and particularly intended for pumping liquid into tanks which are used in garden sprayers. In this particular mechanism, it is desired to pump liquid'into the tank under pressure so that the liquid will discharge itself under pressure. The pressure is obtained by having a quantity of air above the liquid and as the liquid is pumped into the tank, this air is compressed and the compressed air serves to force the air out of the tank under pressure. The pump plunger is used on reciprocating pumps and it is customary to have mounted on the plunger a flexible washer formed from rubber or the like. When this type of pump is power driven, experience has shown that the washer of the plunger, regardless of the material of which it is made, quickly wears out with the result that an improper seal between the plunger washer and the pump cylinder in which it operates is obtained.

It is an object of the present invention to provide a pump plunger so constructed and arranged that the liquid being pumped will force sealing members outwardly from the periphery of the plunger into engagement with the pump cylinder so that a tight seal is always obtained.

Another object of the invention is the provision of a pump plunger of this type so arranged and constructed that the sealing members will be easily removed and replaced.

Another object of the invention is the provision of a pump plunger of this type which will be simple in structure, economical of manufacture, economical and highly eliicient in use and easily modified to account for wear incidental to the operation of the pump.

Other objects will appear hereinafter.

It is recognized that various modifications and changes may be made in detail of structure illustrated without departing from the invention and it is intended that the present disclosure shall be considered to be but the preferred embodiment.

Forming a part of this application are drawings in which,

FIG. 1 is a central sectional view of a liquid receiving tank showing the invention in operative position,

FIG. 2 is a fragmentary enlarged elevational view of the invention,

FIG. 3 is a sectional view taken on line 3-3 of FIG. 2,

FIG. 4 is a sectional view taken on line 44 of FIG. 2,

FIG. 5 is a sectional View taken on line 55 of FIG. 6,

FIG. 6 is a fragmentary side elevational view of the upper end of the piston or plunger rod.

In the drawings I have illustrated a liquid container or tank 9, projecting from the bottom of which is a fitting lt) having a ball check valve 11 and attached to which is a fitting 12 having a ball check valve 13 mounted therein. Fitting communicates with a tube 14 which communicates with the interior of the pump cylinder 15.

fi l lflll Patented July 17, 1962 ice 2 through the top 21 of the tank 19 and through suitable packing 20.

Formed in the member 12 is a passage 21 which communicates through the passage 22 with a suitable source of liquid. Upon operating the plunger upwardly, the liquid is drawn through the passage 21, moving the check valve 13 off its seat, thus drawing the liquid through the member 14 into the interior of the pump cylinder 15. Upon downward movement of the plunger, the ball valve 13. will seat and the ball valve49 will move upwardly from its seat allowing liquid to enter the interior cavity 55 of the pump plunger. At the same time the liquid will be forced downwardly from the member 14 upwardly through the passage 23 so as to move the ball valve 11 from its seat and the liquid will thus pass through passage 24 into the interior 25 of the tank 9. The rod 17 is provided at its lower end with an eyelet'28 through which is extended apin 29 projecting into bearings 29a mounted in the plunger 16 formed in the periphery of the plunger 16. I p

Spaced apart peripheral grooves 30 are formed in the plunger 16 and in each of which is positioned a split metallic presser ring 31 hearing at its periphery against the inner surface a split flexible ring 32 formed from rubber, leather or the like. Radial passages 33 are formed in the hollow end of the plunger 16. As the plunger 16 moves downwardly, it forces the liquid downwardly through the member 14 and upwardly through the passage 23 and 24 into the interior of the tank h. The liquid within the hollow center 55 will be placed under pressure and this liquid will be forced outwardly through the radial passages 33 so as to press against the metallic compensated for by the outward pressure of the metallic split rings 31 against the split sealing rings 32. It is believed obvious that, when this wear becomes excessive, the removal and replacement of the split rings 32 may e easily and quickly effected. As shown in FIG. 3 mem ber 16 is provided with a space 16a in which the rod 17 may tilt in operation, this space 16a being lined by wear plates 16b.

What I claim is:

1. In a pumping mechanism embodying a liquid re- 7 ceiving tank having an outlet conduit extending outwardly therefrom adjacent the top thereof and terminating at its inner end adjacent the bottom of said tank; a pumping mechanism mounted in said tank and comprising a plunger receiving cylinder; a plungerslideably mounted in said cylinder, said plunger having a hollow end, spaced apart peripheral grooves on the hollow end of said plunger, sealing rings mounted in said grooves, each of said grooves being in communication with the hollow end of said cylinder through an opening, said sealing rings being radially outwardly movable into sealing engagement with theinner surface of said cylinder in response to liquid pressure delivered to said grooves through said opening; an inlet conduit communicating with said cylinder below said plunger and also communicating with a source of liquid; a check valve in said inlet conduit between said source of liquid and the lower end of said cylinder for permitting flow of liquid into the lower end of said cylinder from the source of liquid and preventing return flow of liquid from said cylinder to the source of liquid; a fitting communicating with said inlet conduit and with the interior of said tank; and a check valve in said fitting tank; a rod for reciprocating said plunger; a means ion pivotally connecting one end of said rod to said plunger.

2. In a pumping mechanism embodying aliquid receiving tank having an outlet conduit extending outwardly therefrom adjacent the top thereof and terminating at its inner endadjacent the bottom of said tank; a pumping mechanism mounted in said tank and comprising a plunger receiving cylinder; at plunger slideably mounted in said cylinder, said plunger having a hollow end, spaced apart peripheral grooves on the hollow end of said plunger, sealing rings mounted in said grooves, each of said grooves being in communication with the hollow end of said cylinder through an opening, said sealing rings being radially outwardly movable into sealing engagement with the inner surface of said cylinder in response to liquid pressure delivered to said grooves through said opening; an inlet conduit communicating with said cylinder below said plunger and also communicating with a source of liquid; a check valve in said inlet conduit between said source of liquid and the lower end of said cylinder for permitting flow of liquid into the lower end of said cylinder from the source of liquid and preventing return flow of liquid from said cylinder to the source of liquid; a fitting communicating with said inlet conduit and with the interior of said tank; and a check valve in said fitting for permitting flow of liquid therethrough into said tank and preventing fiow of liquid therethrough into said tank;

a rod for reciprocating said plunger; a means for pivotally connecting one end of said rod to said plunger; an eyelet formed on opposite ends of said rod; and a liner of wear resistant material on the inner surface of such eyelet,

References Cited in the file of this patent UNITED STATES PATENTS 

